The Effect of Ruminally Undegradable Protein Using Formaldehyde on the Nitrogen Balance and Productivity of Kacang Goat

Abstract

Kacang goat is one of indigenous breed in Indonesia that has low in productivity. Many researchs have been tried to increase the productivity. Soybean meal (SBM) was palatable for Kacang goat; however the protein of SBM was highly degraded in the rumen. Formaldehyde has been used to increase rumen undegradable protein in ruminant to increase the productivity. The purpose of this study was to increase the productivity of Kacang goat using SBM protected with 1% of formaldehyde. Fifteen heads of yearling Kacang buck, 17.53+1.19 kg were arranged with a completely randomized design in 3 different treatments: SBM: untreated SBM (control); SBM50: 50% untreated SBM + 50% formaldehyde-protected SBM; SBM100: 100% formaldehyde-protected SBM. The rations consisted of 30% Pennisetum purpureum, 30% gliricidia leaves, 19.2% cassava waste product, 13.8% wheat bran, 7% SBM, 1% mineral mix and were formulated containing 14-15% of crude protein (CP). The average daily gain (ADG) was calculated using linear regression of 10 weekly ody weights. Data were analyzed by analysis of variance using the SPSS statistics software version 19. The ADG of SBM control group (90.54+16.22 g) was similar to those of SBM100 (63.71+12.92 g), but it was higher (P<0.01) than those of SBM50 (36.22+24.79 g). However, the ADG of SBM50 was the same as those of SBM100. These trends were similar to the DMI, N intake, digestible N, and retention N. The N intake of untreated SBM was higher (18.47+3.30 g) compared to those of SBM50 (12.65+1.60 g), but the N intake of SBM50 was similar to those of SBM100. It can be concluded that the N retention and production of Kacang goats fed untreated SBM was better than those of goat fed treated SBM. These conditions were mainly reflected by the differences in DMI.